Not sure , but something is definitely not right.
flowplayer 3 javascript file should be included but your webpage does not have it. I don’t know why. I have seen some cases where security plugin removes the javascript tag added by other plugins. Not sure if this is the case.

You can manually add this script tag into your theme file manually if you want to quick fix this.

I do seem to have some issues with that server while I’m trying to sort those out I tried it on a completely separate server and a different subdomain on the original server with the video served either locally or from different server.
Here are some links if you want to have a look

When I tried with Firefox, I noticed that the “server 2 player 6” page’s first video showed “Video file not found” . Then when I refreshed the page, it was working OK.

At this point, I am sorry but I do not know what went wrong. Maybe it’s encoding issue. You may try to encode the video files using (Video:H.264 Baseline) explained in my blog article. Or maybe because the meta data was not moved to the first part of the video file? you need to run qt-faststart to move video metadata into the first section of the video, so the player can show them right away without full downloading the movie. (Although this problem usually occurs with HTML5 video players. Flash player seems showing fine without qt-faststart processing.)